Optical sight for preventing mechanical interference in magnification unit

Abstract

An optical sight includes: an outer barrel formed with a slot; an objective lens unit and an ocular lens unit mounted to opposite ends of the outer barrel; a magnification unit including a first inner barrel tiltably disposed in the outer barrel, a second inner barrel sleeved on the first inner barrel, lens assemblies movably disposed in the first inner barrel, an adjusting ring sleeved on the outer barrel, and an adjusting pin mounted to the adjusting ring; and an adjustment unit operable to adjust inclination of the first and second inner barrels. The second inner barrel is formed with a driven hole registered with the slot. The adjusting pin extends through and is movable along the slot, and includes a drive end received in the driven hole. The drive end is spherical, and has a diameter that is not larger than a diameter of the driven hole.

1 . An optical sight, comprising: 
 an outer barrel having a longitudinal axis, formed with a circumferentially extending slot, and having first and second ends;    an objective lens unit mounted to said first end of said outer barrel;    an ocular lens unit mounted to said second end of said outer barrel;    a magnification unit including a first inner barrel tiltably disposed in and extending between said first and second ends of said outer barrel, a second inner barrel sleeved on said first inner barrel, a plurality of lens assemblies movably disposed in said first inner barrel, an adjusting ring sleeved on said outer barrel, and an adjusting pin mounted to said adjusting ring, said second inner barrel being formed with a driven hole having a first diameter and registered with said circumferentially extending slot, said adjusting pin extending through and being movable along said slot from said adjusting ring and including a drive end received in said driven hole, said drive end being substantially spherical, and having a second diameter that is not larger than said first diameter of said driven hole; and    an adjustment unit mounted on said outer barrel, and operable to adjust inclination of said first and second inner barrels in said outer barrel relative to said longitudinal axis of said outer barrel.    
   
   
       2 . The optical sight of  claim 1 , wherein said driven hole is defined by a substantially cylindrical hole-defining wall.  
   
   
       3 . The optical sight of  claim 1 , wherein said first inner barrel has an outer barrel surface, said drive end of said adjusting pin forming a clearance with said outer barrel surface.  
   
   
       4 . The optical sight of  claim 1 , further comprising a pair of spaced-apart sealing rings interposed between said outer barrel and said adjusting ring, said adjusting pin being disposed between said sealing rings.  
   
   
       5 . The optical sight of  claim 1 , wherein said first inner barrel is formed with a plurality of first cam slots registered respectively with said lens assemblies, and said second inner barrel is formed with a plurality of second cam slots registered respectively with said lens assemblies, each of said lens assemblies including a guide pin that passes through a corresponding one of said first cam slots and that extends into a corresponding one of said second cam slots.  
   
   
       6 . The optical sight of  claim 1 , further comprising a restoring spring interposed between said outer barrel and said first inner barrel, said restoring spring being disposed on a side of said first inner barrel to provide an urging force to said first inner barrel to abut against said adjustment unit.